Cover for conduit outlet boxes



Oct. 7, 1930. 1- pg so Er AL 1,777,530

COVER FOR CONDUI'I OUTLET BOXES Filed April 15 1925 ATTORNEYS Patented 7, 1930 ,roniw rmmson nnn RAYMO D H. dLLEjY, or gsYRAcusn-W NEW? YOBK,,:ASSIGNOBS 'ro CROUSE-HINDS COMPANY, ordsynAcvsn, nnwoyonx, ACORPORATIQNWOI nnvsnv duit outlet boxes of the type-set forth? in our Patent No. 1,525,689, issued February 10, l925,-and has for its object a particularly "simple and efiicient-construction and ar rangement of the" fastening,means and the,

Iii-describing this invention, reference is had to theaccompanying'drawing in'which 7 corresponding.

like l characters designate parts inallthe -views. h

Figurelis a faceview of one'formof conduit outlet box provided 'with this' cover..

Figure Qfisan enlarged sectional view on "line"2-"2,' Fi ur w Figure 3isan1nner' face VIEW of the cover thereto and another removed therefrom. Eigure 'is a fragmentary'sectional View en line 44,V'Figure 3; 'I g Figure 5 is'a 'detail view of the carrier or abutment of the attaching means.

Figure Gis a side-elevation of the abutment member."

wtliitf This inventioncomprises alcover for conduit outlet box "and means for attaching A the cover to the box by thrusting faces or shoulders thereon againstthe inner walls confining the opening of the box and com *?rising a carrier or abutment, arranged on .the inner face of .the cover; and separable therefrom and preferably attachable there to with no fastening members but by merely lmi g or l ymg-n 111 Place n he andfastening or clamping means zas'one or more "wedges coacting with the carrieror abutment to holdit to the cover. and to befibearing' face 6.

thrust laterally thereby during the clamp ing movement of such. member or members and an operating ineans as ajscrewor'screws operable fromithe outside offthe cover and extending through"; the "coverland threading into the clamping member or members so thatupon tighteningwof the screw or screws "the wedge or Wedges are thrust laterally into This invention relatesto covers for c0n-- comparatively shallow andhas' opens 1 g Qi o e s it p gi eingfi su ly receiving clamping screws. The box is 't also providedlwith meansasoneor' norenipples showing one set? of] fastening means apphed covEaFonoonnUIr OUTLET BoxEs engagement with the inner'wall ofthe box a and also firm-1y clamp the carrierforabut ment to the cover. i i In the illustrated it embodiment of i our invention, two sets of attaching'j means are as sociatedowith the cover and also two nwedges or nuts with each set. Although, in use if desired,ione nut can remain in itsgclamped position and the othernut5o erated to attach and-detach the coveror the ase may be co 5 ,structed to thrust directly; i t- Qne side the other side.

of the box while the wedgethrusts against 1 designates the conduit outlet H oblong 0r elongated and comparatively nar-' rowand confined on its longside by flat. walls j I 3 which are free or obstruction aslugs for;

1 fon'coupling it to the'conduitenclosing the ing means on the cover, so that the wires .011 tering. the box or passing through; the box! or passing out of thebox throughtheicover are unobstructedby the fasteningmeans.

5 de'signates" the cover for the openside 2 of the box. The cover havingfa; raisedii'nare. ginal bearing; face 6 forfoverlying the edge of thewall confining theopening 2, this bear ,7 ingfa'ceffi being as highas or higher than theinner surface or; any part thereofofthe intermediate orjbody'part' of the; cover over; is: also Provided with one or more -n'sverseflyf extendingprojections or ribs 7,the outer edges of. which are not higher than the marginal bearing face Prefere ably', theledges faces of these transverse ribs 7 are substantially flushwiththe marginal In I I Owing to thekfa'ctgthat no surfaceef the. a cover projects outwardly beyond theofplane of, or is higher than, the'marginal surface 6, the marginal snrfacelcan be machinedgor. ground ffiatf in orderto the close to theedge of wallaround theopening 20f the box. 8fis the carrier or abutment of,t1 e, means,

for attachingthe cover to the box, this carrier 190 or abutment being separable from the cover and as here shown it coacts with the transverse rib 7 and is in the general form of a channel, the side walls or flanges of which embrace the rib 7, that'is, the channel is arranged astride the rib 7 9 designates the" wedge members, these wedge members being arranged between the end portions of the side flanges of the channel or carrier 'orabutment 8, and each 'nut or wedge-'9 and the carrier or abutment 8 are formed with coacting surfaces which when the nut is tightened tends to wedge the nut laterally into engagement with the opposing side wall of the box and alsoto-clampthe carrier or abutment member onto the inner face of the cover or onto the rib 7 Asjliere illustrated, the bottom of'the channel or carrier or abutment terminates short. of the ends of the carrier or'abutment in order to permit,

the nut or nuts to be placed between the side flanges of the ba'se8 and this bottomris in the form of a corrugation, 10, the end edges of which are beveled outwardly as at 1 1 and each nut 9 is formed "with a corresponding beveled face'icoacting'with.the edge 11.

Theface of each nut 9'wl1ich coacts with the wall 3 of the bo'x i salso slightly beveled as at-12 and coact with a correspondingly beveled face on'the'wall of the box), 3

13 are screws extending through openings 14 in the cover and threadinginto the nuts.

In order'to prevent shifting of .the'carrier or. abutment 8 means i's'provided by which it interlocks with the rib 7 against endwise move'-.

ment, and as here illustra,ted,the side flanges are provided withinturned lugs 15 at their lower edges and midway between their ends,

these lugs extending into a notch 16 between the ends of each rib 7. The notch usually extends the full depth of the rib.' I

In operation, after thecover or the bearing face 6 thereof is machined, or ground, the carriers or abutments 8 are placedv on the ribs 7, the screws inserted in the holes 14: and threaded into the nuts, and usually the ends of the shanks of the nuts, are headed at'17 to prevent complete detachment of the screws from the nut. After the cover is applied to the box, the screws are tightened causing the nuts to be thrust laterally against the inner faces of the walls of the box andfalso causing" the nutsto clamp the'base 8 securely in place.

Owing to the'beveled faces 12 of the nuts and the'correspondingly beveled faces on the walls of the box, the cover is, drawn tightly.

onto the box and owing to the greaterincline of the cam faces 11 on the carrier or abutment 8 with respect to the incline of the faces 12 on the nuts, the nuts arethrust laterally and the cover tightly clamped in'position upon asmall movement ofthescrews 13. If desired, the'nut at one endof each carrier or abutment 8 ma beclamped onto the carrier or abutment'to its'full extent before the cover means by which the entire attaching means is attachable to the cover, the cover can be readily finished to fit the box before the attachi r is I P9jh evet= WVhat-wecla-im 1 i-n g means are "assembled h com in ti n with a conduit outlet box -hav-ing -anopening in one side, a cover for the opensidehaving a marginal bearing face overlying "tlieedge of the wall around the e in thaQ e a s h v ng e. ans-r verse projection on its inner side, the transf verse, projection being'formed with a notch between'itsends, and means carried byvthe C r for at h ng he c rt h o omprising anabutmentinthe form of a chan-w-q nel arrangedastride theprojection, and hav-- ing inwardly extending lugs locatedin the notch and shouldering against the walls, 7 thereof, the bottom of the, channel terminating short of the endsj'thereof, and being pro- I vided with. outwardly inclined faces, nu ts arrangedfin the endportions of the channel and coacting with the inclined faces to be thrust laterally during-clamping movement of the through the cover from the outer side thereof and threading into the nut; I l

2. The combination with a box having an opening in one side, of a cover for the open side, the cover being provided with a raised marginal bearing face for overlying the edge of the wall of the box around the opening raised proj ectionsv within the marginal bearing face, saidvbearing face and tlieouter end faces of said-projections being arranged in substantially the .same plane, means carricdby. the cover for attaching the cover to the box comprising an abutment carried on the inner face of the cover within said marginal bearing face, thecover and said abutment'h'aving interlocking means for v detachably securing the fabutment to .the

ondiiit outlet nut's toward the coverfand screws extending cover, means for engagingthe inner walls of '7 the box to secure the cover to the box including a" laterally movable wedge member coacting withthe abutment, the abutment and the wedge-member having. coacting faces arranged to act inclined plane'fashion for movingsaidwedge member laterally into engagement' with the wall of thebox and means extending through the cover and coacting with the wedge member for operating the same. i

' j 3. Thecombination with a conduit outlet" box having an openinginone side, of a cover for the open side having a marginal bearing face overlying the edge of the wall around the opening, the cover also having a transverse projection ,on its inner side, an abutment in the form of a channel arranged astride said projection snugly fitting the same, clamping means coactingwith opposing walls of the box and including wedging means coacting with the abutment, the wedg- 7 7 boxhaving an opening in one side, of a cover for the open side having amarginal bearing face overlying the edge of the wall around the opening, the cover also having a transverse pro ection on 1ts inner side, an abutment in the form of a channel arranged astride the projection, the end portions of the bottom of the channel being removed and the intermediate portion of the bottom being formed with an inwardly projecting corrugation extending into the channel, the end edges of said corrugationbeing beveled, nuts arranged in each end portion of the channel between the flanges and coacting with said beveled faces and screws extending through the cover from the outer side thereof and threading into the nuts,

5. The combination with a conduit outlet box having an opening in oneside, of a cover, for the open side having a marginal bearing face overlying the edge of the wall around the opening, the cover also having a transverse projection on itsinner side, an abutment in the form of a channel arranged astride the projection, the end portions of the bottom of the channel being removed and the intermediate portion of the bottom being formed with an inwardly projecting corrugation extending into the channel, nuts arranged in each end portion of the channel between the flanges and coacting with the end edges of the corrugations, the nut and end edges having faces formed to coact inclined plane fashion and screws extending through the cover from the outer side thereof and threading into the nuts, each projection being formed with notches in opposite sides thereof and the flanges of the channel of the abutment having inturned lugs between the ends of said flanges for interlocking with the notches.

In testimony whereof, we have hereunto V signed our names, at Syracuse, in the county of Onondaga, and State of New York, this 6th day of April, 1925. 7

JOHN T. PEARSON. RAYMOND H. OLLEY. 

